Why is there a saying that cold is in Sanjiu, and hot is in Sanfu .

Because Sanjiu and Sanfu are the hottest and coldest times of the year.

<> "Why shout, it's cold in Sanjiu, and it's hot in Sanfu."

The two proverbs of "cold in Sanjiu" and "hot in Sanfu" are the experiences accumulated by people in the practice of life over a long period of time. "Sanjiu" refers to the third "nine days" after the winter solstice, which is about mid-to-late January. "Three dogs" refers to the first volley orange (the third Geng day after the summer solstice), the middle volley (the fourth Geng day after the summer solstice) and the last volley (the first Geng day after the beginning of autumn), which is about mid-July to mid-August.

Why is "Sanjiu" the coldest and "Sanfu" the hottest?

Although the days are short during the winter solstice, the ground absorbs the least amount of solar radiant heat, but because the ground emits more heat than it absorbs, the air temperature of the ground continues to decrease, and the solar heat absorbed by the ground is almost equal to the heat emitted by the ground, and the weather reaches the coldest time. After the "39th", the heat absorbed by the ground will be more than the heat lost by the ground, and the air temperature near the ground will gradually rise. Therefore, the coldest time of the year generally occurs around the "39" after the winter solstice.

The summer solstice is the day with the longest days and the shortest nights, but the hottest time of the year is not the summer solstice, but the "dog days" after the summer solstice. Like the Dao Zheng Wu Pengli above, after the summer solstice, although the days are getting shorter and the nights are getting longer, but in the middle of the day, the days are still longer than the nights, and the heat absorbed by the ground is still more than the heat emitted every day, and the air temperature near the ground is getting higher and higher day by day. During the dog days, the ground absorbs almost as much heat as it dissipates, and the weather is at its hottest.

After that, the ground begins to absorb less heat than the ground emits and the temperature slowly drops. Therefore, the hottest time of the year generally occurs after the summer solstice.

Dog days are different from year to year. The first volts are generally concentrated in mid to late July, the middle volts are concentrated in late July and early August, and the last volts are concentrated around mid-August. The reason why it is cold in Sanjiu and hot in Sanfu depends not only on the income of heat, but also on the expenditure of the ground to radiate heat into space.

When the two reach equilibrium, the temperature can rise or fall. Although the amount of solar radiation received by the ground begins to decrease after the summer solstice, it is still greater than the expenditure, and the temperature remains rising until the balance of income and expenditure (dog days) is reached. Similarly, from the winter solstice to the 39th month, the temperature continued to drop because the surface heat expenditure was still greater than the income, until it began to rise after the 39th month.

However, this experience also has regional limitations. It is true that Chinese mainland is mainly hot in Zhongfu and Toufu, but the hottest period in coastal areas (within 30 50 km of the coast) and islands occurs in May, before thunderstorms, when there are still two months left. In the Spratly Islands, near the equator, dog days are one of the two coldest seasons of the year, although temperatures vary little throughout the year.

So, the heat in the three volts is not the heat in the third volt (the last volt), nor the heat in the whole volt, but mainly in the middle volt, and the heat is mainly in the middle volt. Saying that the heat is in the dog days is just to fight the cold in the three dogs, write it down. So, it's too late to reach the heat budget, when the maximum temperature occurs.

Taking Shandong as an example, the inland region of Dezhou is the hottest of the year, while the peak of the Shandong Peninsula at the same latitude is later than mid-August. Similarly, the coldest period of the year on the coastal islands should be postponed until the end of March. But strangely, the summit of the mountain is basically still cold at the end of March.

The reason turned out to be that the cold air that falls south from Siberia in winter is so strong that it is difficult for the northern coast to show such an oceanic conditioning. It did not begin to appear until the south of the Yangtze River. For example, the Shengbu Islands, located east of Shanghai and the East China Sea, are at their coldest in early February.

But even in the cold season, the heat is still in the middle. What is so laughable is that in the 70s of the last century, there were rare high temperature weather for 7 consecutive days in the middle and lower reaches of the Yangtze River (of course, it is a history of petty bourgeoisie), such as Wuhan, where the average daily temperature was as high as 33, causing heat stroke in many people.

This is the famous autumn tiger. On the contrary, in 1978, the rainy season was short-lived, and the drought period was brought forward. For example, the average temperature in Hangzhou in early July is 32

The highest temperature in the afternoon was about 18 degrees, which is a rare hot day in history.

Cold in. Three.

9. Heat in the dog days" is to say:. Sanjiu is the coldest time of the year, and Sanfu is the hottest time of the year.

In most parts of China, the coldest and hottest periods of the year are not the winter solstice and summer solstice, when the solar altitude is lowest (solar radiation is the weakest) and the highest (solar radiation is the strongest), but it is often delayed, which is the proverb "cold in."

Three. 9. The heat is in the dogs".

"Sanjiu" refers to counting from the winter solstice to the third nine, roughly from the 9th to the 17th of January. The "dog days" vary from year to year, generally in mid-to-late July, in late July and early August, and around mid-August.

The cold air from Siberia south in winter is too strong for the northern coast to show this oceanic conditioning. It does not begin to appear until the south of the Yangtze River, for example, east of Shanghai, the Shengsi Islands in the East China Sea, which are coldest in early February.

This sentence is the conclusion that our stroke has reached through constant observation of climate change, and of course it is so, <>

The Earth's axis of rotation is tilted at an angle, and when it revolves around the Sun, there are four seasons that change between hot and cold. However, in most parts of China, the coldest and hottest periods of the year are not the winter and summer solstices, which have the lowest and highest solar heights of the year, but tend to be delayed, which is what the proverb calls the cold solstice.

Three. 9. The heat is in the dogs".

There is a Chinese saying that the dog days are practiced in summer and the three nines are practiced in winter, which means that the three dog days and the three nineties are the hottest and coldest times of the year, and diligent people are exercising at such extreme temperatures. Heat in the Dog DaysThree Dog Days is a collective term for the first, middle and last volts, and is the hottest time of the year. It occurs every year from mid-July to mid-August in the solar calendar.

So when we hear about dog days or news reports, everyone knows it's time for the hottest! That's right, it's all this time!

Leng in 3939 refers to the third nine days after the winter solstice, that is, the nineteenth to twenty-seventh days after the winter solstice. From the beginning of the winter solstice, count nine to calculate the season, every nine days for nineteen, the first nine days are called nineteen, the second nine days are called twenty-nine, and so on, until ninety-nine, counting nine hundred and eighty-one days is out of nine, which means that winter has passed at this time, and spring has come. Therefore, it makes sense that the cold is in Sanjiu and the heat is in Sanfu, but fortunately, we are now in good condition, and we can avoid experiencing a lot of unnecessary weather tests.